import { i18n } from '/@/locales/setupI18n';

type I18nGlobalTranslation = {
   (key: string): string;
   (key: string, locale: string): string;
   (key: string, locale: string, list: unknown[]): string;
   (key: string, locale: string, named: Record<string, unknown>): string;
   (key: string, list: unknown[]): string;
   (key: string, named: Record<string, unknown>): string;
};

type I18nTranslationRestParameters = [string, any];

function getKey(namespace: string | undefined, key: string) {
   if (!namespace) {
      return key;
   }
   if (key.startsWith(namespace)) {
      return key;
   }
   return `${namespace}.${key}`;
}

export function useI18n(namespace?: string): {
   t: I18nGlobalTranslation;
} {
   const normalFn = {
      t: (key: string) => {
         return getKey(namespace, key);
      },
   };

   if (!i18n) {
      return normalFn;
   }

   const { t, ...methods } = i18n.global;

   const tFn: I18nGlobalTranslation = (key: string, ...arg: any[]) => {
      if (!key) return '';
      if (!key.includes('.') && !namespace) return key;
      return t(getKey(namespace, key), ...(arg as I18nTranslationRestParameters));
   };
   return {
      ...methods,
      t: tFn,
   };
}

// Why write this function？
// Mainly to configure the vscode i18nn ally plugin. This function is only used for routing and menus. Please use useI18n for other places

// 为什么要编写此函数？
// 主要用于配合vscode i18nn ally插件。此功能仅用于路由和菜单。请在其他地方使用useI18n
export const t = (key: string) => key;
